Showing posts from September, 2022Show All
The speed of water is 2m/s through a pipe of internal diameter 10 cm. What should be the internal diameter of nozzle of the pipe if the speed of water at nozzle is 4 m/s?

The speed of water is 2m/s through a pipe of internal diameter 10 cm. What should be the internal diameter of nozzle of the pipe if the speed of water at nozzle is 4 m/s?

Manoj Jaiswar ( PMJ Sir )
by Manoj Jaiswar ( PMJ Sir ) September 20, 2022

Three resistors 10 Ω, 20 Ω and 30 Ω are connected in series combination. i] Find equivalent resistance of series combination. ii] When this series combination is connected to 12V supply, by neglecting the value of internal resistance, obtain potential difference across each resistor.

Three resistors 10 Ω, 20 Ω and 30 Ω are connected in series combination. i] Find equivalent resistance of series combination. ii] When this series combination is connected to 12V supply, by neglecting the value of internal resistance, obtain potential difference across each resistor.

Manoj Jaiswar ( PMJ Sir )
by Manoj Jaiswar ( PMJ Sir ) September 19, 2022

A battery of emf 12 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, a] Calculate resistance of resistor. b] Calculate terminal voltage of the battery when the circuit is closed.

A battery of emf 12 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, a] Calculate resistance of resistor. b] Calculate terminal voltage of the battery when the circuit is closed.

Manoj Jaiswar ( PMJ Sir )
by Manoj Jaiswar ( PMJ Sir ) September 17, 2022

If the Earth were made of wood, the mass of wooden Earth would have been 10% as much as it is now (without change in its diameter). Calculate escape speed from the surface of this Earth.

If the Earth were made of wood, the mass of wooden Earth would have been 10% as much as it is now (without change in its diameter). Calculate escape speed from the surface of this Earth.

Manoj Jaiswar ( PMJ Sir )
by Manoj Jaiswar ( PMJ Sir ) September 17, 2022

At what distance below the surface of the Earth, the acceleration due to gravity decreases by 10% of its value at the surface, given radius of Earth is 6400 km.

At what distance below the surface of the Earth, the acceleration due to gravity decreases by 10% of its value at the surface, given radius of Earth is 6400 km.

Manoj Jaiswar ( PMJ Sir )
by Manoj Jaiswar ( PMJ Sir ) September 15, 2022

A certain sound wave in air has a speed 340 m/s and wavelength 1.7 m for this wave, calculate a) the frequency b) the period.

A certain sound wave in air has a speed 340 m/s and wavelength 1.7 m for this wave, calculate a) the frequency b) the period.

Manoj Jaiswar ( PMJ Sir )
by Manoj Jaiswar ( PMJ Sir ) September 15, 2022

A current 4A flows through an automobile headlight. How many electrons flow through the headlight in a time 2hrs.

A current 4A flows through an automobile headlight. How many electrons flow through the headlight in a time 2hrs.

Manoj Jaiswar ( PMJ Sir )
by Manoj Jaiswar ( PMJ Sir ) September 08, 2022

The heating element connected to 230V draws a current of 5A. Determine the amount of heat dissipated in 1 hour (J = 4.2 J/cal.).

The heating element connected to 230V draws a current of 5A. Determine the amount of heat dissipated in 1 hour (J = 4.2 J/cal.).

Manoj Jaiswar ( PMJ Sir )
by Manoj Jaiswar ( PMJ Sir ) September 08, 2022